﻿//
// (C) Copyright 2009 Irantha Suwandarathna (iranthas@hotmail.com)
// All rights reserved.
//

/* Copyright (c) 2001-2008, The HSQL Development Group
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 * modification, are permitted provided that the following conditions are met:
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 * Redistributions of source code must retain the above copyright notice, this
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 * this list of conditions and the following disclaimer _in the documentation
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 *
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 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using EffiProz.Core.Errors;
using EffiProz.Core.Lib;
using EffiProz.Core.DataTypes;


namespace EffiProz.Core
{
    /**
 * Table with data derived from a query expression.
 *
 * @author Fred Toussi (fredt@users dot sourceforge.net)
 * @version 1.9.0
 * @since 1.9.0
 */
    public class TableDerived : Table
    {

        public QueryExpression queryExpression;
        public View view;

        public TableDerived(Database database, QNameManager.QName name, int type) :  base(database, name, type)
        {         
            switch (type)
            {

                case TableBase.FUNCTION_TABLE:
                case TableBase.VIEW_TABLE:
                    break;

                default:
                    throw Error.runtimeError(ErrorCode.U_S0500, "Table");
            }
        }

        public TableDerived(Database database, QNameManager.QName name, int type,
                            QueryExpression queryExpression) : base(database, name, type)
        {           
            switch (type)
            {

                case TableBase.SYSTEM_SUBQUERY:
                case TableBase.VIEW_TABLE:
                case TableBase.RESULT_TABLE:
                    break;

                default:
                    throw Error.runtimeError(ErrorCode.U_S0500, "Table");
            }

            this.queryExpression = queryExpression;
        }

        public TableDerived(Database database, QNameManager.QName name, int type,
                            SqlType[] columnTypes, HashMappedList columnList,
                            QueryExpression queryExpression) : this(database, name, type, queryExpression)
        {

            

            this.colTypes = columnTypes;
            this.columnList = columnList;
            columnCount = columnList.size();
            primaryKeyCols = new int[0];
            primaryKeyTypes = SqlType.emptyArray;
            primaryKeyColsSequence = new int[0];
            colDefaults = new Expression[columnCount];
            colNotNull = new bool[columnCount];
            defaultColumnMap = new int[columnCount];

            ArrayUtil.fillSequence(defaultColumnMap);

            bestIndexForColumn = new int[colTypes.Length];

            ArrayUtil.fillArray(bestIndexForColumn, -1);
            createPrimaryIndex(primaryKeyCols, primaryKeyTypes, null);
        }

        public TableDerived(Database database, QNameManager.QName name, int type,
                           SqlType[] columnTypes,byte[] columnNullability, HashMappedList columnList,
                           QueryExpression queryExpression)
            : this(database, name, type, queryExpression)
        {



            this.colTypes = columnTypes;
            this.columnList = columnList;
            columnCount = columnList.size();
            primaryKeyCols = new int[0];
            primaryKeyTypes = SqlType.emptyArray;
            primaryKeyColsSequence = new int[0];
            colDefaults = new Expression[columnCount];
            colNotNull = new bool[columnCount];
            for (int i = 0; i < colNotNull.Length; i++)
                colNotNull[i] = columnNullability[i] == SchemaObjectNullability.NO_NULLS;
            defaultColumnMap = new int[columnCount];

            ArrayUtil.fillSequence(defaultColumnMap);

            bestIndexForColumn = new int[colTypes.Length];

            ArrayUtil.fillArray(bestIndexForColumn, -1);
            createPrimaryIndex(primaryKeyCols, primaryKeyTypes, null);
        }

        public override int getId()
        {
            return 0;
        }

        public override bool isWritable()
        {
            return true;
        }

        public override bool isInsertable()
        {
            return queryExpression == null ? false
                                           : queryExpression.isInsertable();
        }

        public override bool isUpdatable()
        {
            return queryExpression == null ? false
                                           : queryExpression.isUpdatable();
        }

        public override int[] getUpdatableColumns()
        {
            return defaultColumnMap;
        }

        public override Table getBaseTable()
        {
            return queryExpression == null ? this
                                           : queryExpression.getBaseTable();
        }

        public override int[] getBaseTableColumnMap()
        {

            return queryExpression == null ? null
                                           : queryExpression
                                               .getBaseTableColumnMap();
        }

        public void setQueryExpression(QueryExpression qe)
        {
            queryExpression = qe;
        }

        public QueryExpression getQueryExpression()
        {
            return queryExpression;
        }
    }
}
